Falkentyne wrote:Master Chief already wrote a good explanation, but please keep in mind that the "green" you see with weak and light is simply a fainter yellow (not green), with the color bias changed from the cyan background. Change the background to black/grey/white or middle greys, and you'll see the green trail turn yellow and look far more like you would expect it to look. (this is low to no RTA artifacts, from weak overdrive). Basically you see a dimmer copy of the UFO.
Yes, this is true -- here's a photo of the "green" ghost hehind the yellow domes.
See the green ghost behind the dome. Many monitors don't have good enough overdrive to eliminate this green ghost while
simultaneously keeping coronas away.
Some monitors erase this very well with only extremely faint artifacts -- such as the
240Hz Acer Predator XB252Q, which during good neutral overdrive ("NORMAL") has almost no ghosting and coronas. At 240fps@240Hz on this model of monitor -- you actually are able to get 50% less motion blur than 120Hz, and 75% less motion blur than 60Hz.
Please note, not all 240Hz monitors allow you to have 50% less motion blur than a 120Hz monitor. From TFTCentral's review, two different 240Hz monitors can have very significant difference in motion clarity, due to better neutral overdrive.
One big advantage for ghosting-sensitive people, is that we've found that at 240Hz -- the extra rapid refresh cycle passes also can cleans up ghosting more quickly -- but only if the overdrive is properly tuned to 240Hz, as the image above attests. So LCD GtG pixel transition side effects are also cleaned up quicker with well-tuned 240Hz ovedrive. At least when it comes to this particular "1ms GtG" TN panel.
I also have a Viewsonic XG2530 here too [will be tested too], and the quality is similar too.
All were far clearer than the overdrive implementation in
AOC's first 240Hz monitor;
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ASUS ROG PG258Q
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Acer Predator XB252Q
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Viewsonic XG2530
These are relatively ghost-free 240Hz monitors. I suspect the Benq/Zowie
XL2540 and the
XL2546 (with strobing turned off) is similar, but we don't have access to these monitors at the moment.
Pixel transition speed (GtG) limitations will also play a huge role. IPS motion clarity seems to max out at roughly ~120Hz (very little difference going to 165Hz). But TN motion clarity keeps going up (Even beyond 240Hz...), with the best 240Hz TN LCD having half the motion blur of the best 120Hz TN LCD. Lately, TN panels has been very friendly to technological progress in overdrive, apparently -- even though improved overdrive developments tend to lag behind refresh rate developments.
Now, fixing ghosting in an existing desktop monitor that has major ghosting problems, that's another story -- sometimes it just is a tough compromise (a game of tradeoffs between ghosting and coronas).